how to obtain the threshold 25% of the gray intensities?

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fred bnm 2016-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/309118-how-to-obtain-the-threshold-25-of-the-gray-intensities

评论： Image Analyst 2016-10-25

Hi, i want to binarize an image by using thresholding.how to obtain threshold 25% of the gray intensities? (25% of the lower gray intensities are discarded) please gudie me.

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Image Analyst 2016-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/309118-how-to-obtain-the-threshold-25-of-the-gray-intensities#answer_240663

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Try this

binarizedImage = grayImage > 0.25 * intmax(class(grayImage));

That should work for uint8 or uint16 images and produce a logical image of the same size.

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fred bnm 2016-10-25

编辑：fred bnm 2016-10-25

this is (maximum) More acceptable Compared to the previous.Because that is more adaptable than any image.in fact I am looking for pixels that have 75% of the total gray level image. if you know another method that is suitable for thresholding for Include pixels on edges Please explain.

Image Analyst 2016-10-25

You have to be more precise in your wording. "pixels that have 75% of the total gray level image" is not precise enough to know what you mean. Do you mean a gray level such that when thresholded at that gray level, 75% of the pixels will be selected? Or do you mean the gray level that is at 25% of the max gray level allowed for that class (uint8 or uint16)? Or do you mean the gray level that is 25% of the max gray level that occurs in the image? Or something else. I don't know.

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